nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc

影響: pip:nbconvert >= 5.4.0, <= 7.17.1 → 7.17.2

nbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute. Vulnerable converters : --to markdown, --to latex, --to rst, --to asciidoc. In ExtractOutputPreprocessor, extractoutput.py:116-119 joins attacker-controlled path to output_files_dir with no canonicalization check, enabling arbitrary file write. This is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg. Impac…

Read on GitHub Advisory Database

On 10/23/2026, 01:23 AM, GitHub Advisory Database published "nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc" (type: Advisory). Severity is "High" (high). Related technologies: Python, GitHub. CVE: CVE-2026-114140.